Sunday, 10 December 2017

Madbean Zombii / ZVex Fat Fuzz Factory

Tweaked Mark's original compact layout according to the info i found on the fat mode switch. Should be good to go.

21 comments:

  1. Thanks miro. I was going to try and etch one from the perf/pcb blog but this us much easier. Ill bang it together tonight and let you know

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  2. So the fat thing here is a sort of feedback loop with a 10 uf cap and 1M resistor in paralel, right?
    Time ago I tried something to get my original unit fatter, but was a total failure...

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    1. Nope. The 1M just won't let the bigger cap have any signal trough it. Once that is shorted with a switch, the 0,1µ and 10µ are in parallel, totalling at 10.1µ. Point of the 1M is to prevent noise from flicking the switch.
      +m

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  3. looks great! The original has a 3-position switch (on-off-on) though. I built one recently, but can't remember which caps I ended up with...

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    1. Was not aware of that. This "fat mod" was the only documentation i've seen. One could easily take the original layout and take the 100n cap to a DPDT on-off-on switch with two additional caps.

      ...so basically this layout is quite unnecessary :)
      +m

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    2. Would you remove that 1M and switch the 100n cap? Or would there be 2 switches? Is this what Wannes G mean't http://effectslayouts.blogspot.com/2016/03/zvex-fat-fuzz-factory.html

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    4. I just used one switch (SPDT on-off-on), each side placing an additional cap in parallel with the 100n. I started from the original layout on this site, so no extra 1M in there.
      My caps were probably a 470n and a 3u3, or something similar. I gave the pedal away, so can't check anymore.

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    5. I can't seem to get it to do that really gated sound. The typical FF squeals etc. Whats the likely culprit?

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  4. Great layout, cheers.. Does anyone know anything about the lucky 7 fuzz factory? does anyone have the layout for that?

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  5. Thanks for the killer layout Miro! She is verified. First fuzz factory I have built...weird. Only have one question. Is the fuzz control very subtle? Otherwise all the controls work well. Good fuzz, cleans up and is versatile!(Q1-2n3904 hfe 385, Q2- Ge Russian hfe 57, Q3-generic Ge hfe 147) Tried a few transistors per online discussions and these worked well. Have a great day! RAWK! \m/

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    1. From the Fuzz Factory I built a long time ago I say yeah it's subtle! I basically either set it to 1 or 10! Sometimes 7ish if there's too much noise. With the Stability down it becomes more useful to tweak though.

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    2. right on THANKS! then this functions perfectly.

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  7. So is the fat switch SPDT or SPST because im not seeing where solder the third lug. Thanks

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  8. There is a mistake on this layout. The 5.1K needs to be to the collector of Q3, not the base.

    The original fat switch is a 3 position although no one online seems to know for sure if it's on-on-on or on-off-on or what caps are used.

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  9. Where does the 3rd stab pin go?

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    1. The Schematic connects pin 2 and 3 of the stab control together

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  10. Thank you I'll give it a go

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  11. I have made some tests and fat capacitor (10uF) has reversed polarity. It sounds like Fat Fuzz Factory once (-) is connected to Q1-C and + to Q2-B.
    In my opinion the best cap would be 4.7uF.

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